<template>
  <el-col v-if="widget.type === 'grid-col'" class="grid-cell" v-bind="layoutProps" :class="[selected ? 'selected' : '', customClass]" :style="colHeightStyle" :key="widget.id" @click.stop="selectWidget(widget)">
    <draggable
      :list="widget.widgetList"
      item-key="id"
      v-bind="{ group: 'dragGroup', ghostClass: 'ghost', animation: 200 }"
      tag="transition-group"
      :component-data="{ name: 'fade' }"
      handle=".drag-handler"
      @end="(evt) => onGridDragEnd(evt, widget.widgetList)"
      @add="(evt) => onGridDragAdd(evt, widget.widgetList)"
      @update="onGridDragUpdate"
      :move="checkContainerMove"
    >
      <template #item="{ element: subWidget, index: swIdx }">
        <div class="form-widget-list">
          <template v-if="'container' === subWidget.category">
            <component :is="subWidget.type + '-widget'" :widget="subWidget" :designer="designer" :key="subWidget.id" :parent-list="widget.widgetList" :index-of-parent-list="swIdx" :parent-widget="widget"></component>
          </template>
          <template v-else>
            <component :is="subWidget.type + '-widget'" :field="subWidget" :designer="designer" :key="subWidget.id" :parent-list="widget.widgetList" :index-of-parent-list="swIdx" :parent-widget="widget" :design-state="true"></component>
          </template>
        </div>
      </template>
    </draggable>

    <div class="grid-col-action" v-if="designer.selectedId === widget.id && widget.type === 'grid-col'">
      <i :title="i18nt('designer.hint.selectParentWidget')" @click.stop="selectParentWidget(widget)"><svg-icon icon-class="el-back" /></i>
      <i v-if="!!parentList && parentList.length > 1" :title="i18nt('designer.hint.moveUpWidget')" @click.stop="moveUpWidget()"><svg-icon icon-class="el-move-up" /></i>
      <i v-if="!!parentList && parentList.length > 1" :title="i18nt('designer.hint.moveDownWidget')" @click.stop="moveDownWidget()"><svg-icon icon-class="el-move-down" /></i>
      <i :title="i18nt('designer.hint.cloneWidget')" @click.stop="cloneGridCol(widget)">
        <svg-icon icon-class="el-clone" />
      </i>
      <i :title="i18nt('designer.hint.remove')" @click.stop="removeWidget">
        <svg-icon icon-class="el-delete" />
      </i>
    </div>

    <div class="grid-col-handler" v-if="designer.selectedId === widget.id && widget.type === 'grid-col'">
      <i>{{ i18nt("designer.widgetLabel." + widget.type) }}</i>
    </div>
  </el-col>
</template>

<script>
import i18n from "@/components/FormDesigner/utils/i18n";
import FieldComponents from "@/components/FormDesigner/form-widget/field-widget/index";
import refMixinDesign from "@/components/FormDesigner/refMixinDesign";
import SvgIcon from "@/components/FormDesigner/svg-icon";

export default {
  name: "GridColWidget",
  componentName: "GridColWidget",
  mixins: [i18n, refMixinDesign],
  inject: ["refList"],
  components: {
    ...FieldComponents,
    SvgIcon
  },
  props: {
    widget: Object,
    parentWidget: Object,
    parentList: Array,
    indexOfParentList: Number,
    designer: Object,

    colHeight: {
      type: String,
      default: null
    }
  },
  data() {
    return {
      layoutProps: {
        span: this.widget.options.span || 12,
        // md: this.widget.options.md || 12,
        // sm: this.widget.options.sm || 12,
        // xs: this.widget.options.xs || 12,
        offset: this.widget.options.offset || 0,
        push: this.widget.options.push || 0,
        pull: this.widget.options.pull || 0
      }
    };
  },
  computed: {
    selected() {
      return this.widget.id === this.designer.selectedId;
    },

    customClass() {
      return this.widget.options.customClass || "";
    },

    colHeightStyle() {
      return this.colHeight ? { height: this.colHeight + "px" } : {};
    }
  },
  watch: {
    "designer.formConfig.layoutType": {
      handler(val) {
        if (this.widget.options.responsive) {
          if (val === "H5") {
            this.layoutProps.span = this.widget.options.xs || 12;
          } else if (val === "Pad") {
            this.layoutProps.span = this.widget.options.sm || 12;
          } else {
            this.layoutProps.span = this.widget.options.md || 12;
          }
        } else {
          this.layoutProps.span = this.widget.options.span || 12;
        }
      }
    },

    "widget.options.responsive": {
      handler(val) {
        let lyType = this.designer.formConfig.layoutType;
        if (val) {
          if (lyType === "H5") {
            this.layoutProps.span = this.widget.options.xs || 12;
          } else if (lyType === "Pad") {
            this.layoutProps.span = this.widget.options.sm || 12;
          } else {
            this.layoutProps.span = this.widget.options.md || 12;
          }
        } else {
          this.layoutProps.span = this.widget.options.span || 12;
        }
      }
    },

    "widget.options.span": {
      handler(val) {
        this.layoutProps.span = val;
      }
    },

    "widget.options.md": {
      handler(val) {
        this.layoutProps.span = val;
      }
    },

    "widget.options.sm": {
      handler(val) {
        this.layoutProps.span = val;
      }
    },

    "widget.options.xs": {
      handler(val) {
        this.layoutProps.span = val;
      }
    },

    "widget.options.offset": {
      handler(val) {
        this.layoutProps.offset = val;
      }
    },

    "widget.options.push": {
      handler(val) {
        this.layoutProps.push = val;
      }
    },

    "widget.options.pull": {
      handler(val) {
        this.layoutProps.pull = val;
      }
    }
  },
  created() {
    this.initRefList();
    this.initLayoutProps();
  },
  methods: {
    initLayoutProps() {
      if (this.widget.options.responsive) {
        let lyType = this.designer.formConfig.layoutType;
        if (lyType === "H5") {
          this.layoutProps.span = this.widget.options.xs || 12;
        } else if (lyType === "Pad") {
          this.layoutProps.span = this.widget.options.sm || 12;
        } else {
          this.layoutProps.span = this.widget.options.md || 12;
        }
      } else {
        this.layoutProps.span = this.widget.options.span;
      }
    },

    onGridDragEnd(evt, subList) {
      //
    },

    onGridDragAdd(evt, subList) {
      const newIndex = evt.newIndex;
      if (subList[newIndex]) {
        this.designer.setSelected(subList[newIndex]);
      }

      this.designer.emitHistoryChange();
    },

    onGridDragUpdate() {
      this.designer.emitHistoryChange();
    },

    selectWidget(widget) {
      console.log("id: " + widget.id);
      this.designer.setSelected(widget);
    },

    checkContainerMove(evt) {
      return this.designer.checkWidgetMove(evt);
    },

    selectParentWidget() {
      if (this.parentWidget) {
        this.designer.setSelected(this.parentWidget);
      } else {
        this.designer.clearSelected();
      }
    },

    moveUpWidget() {
      this.designer.moveUpWidget(this.parentList, this.indexOfParentList);
    },

    moveDownWidget() {
      this.designer.moveDownWidget(this.parentList, this.indexOfParentList);
    },

    cloneGridCol(widget) {
      this.designer.cloneGridCol(widget, this.parentWidget);
    },

    removeWidget() {
      if (this.parentList) {
        let nextSelected = null;
        if (this.parentList.length === 1) {
          if (this.parentWidget) {
            nextSelected = this.parentWidget;
          }
        } else if (this.parentList.length === 1 + this.indexOfParentList) {
          nextSelected = this.parentList[this.indexOfParentList - 1];
        } else {
          nextSelected = this.parentList[this.indexOfParentList + 1];
        }

        this.$nextTick(() => {
          this.parentList.splice(this.indexOfParentList, 1);
          //if (!!nextSelected) {
          this.designer.setSelected(nextSelected);
          //}

          this.designer.emitHistoryChange();
        });
      }
    }
  }
};
</script>

<style lang="scss" scoped>
.grid-cell {
  min-height: 38px !important;
  //margin: 6px 0;  /* 设置了margin，栅格列的offset、push、pull会失效！！ */
  padding: 3px;
  outline: 1px dashed #336699;
  position: relative;

  .form-widget-list {
    min-height: 28px;
  }

  .grid-col-action {
    position: absolute;
    bottom: 0;
    right: -2px;
    height: 28px;
    line-height: 28px;
    background: $--color-primary;
    z-index: 999;

    i {
      font-size: 14px;
      color: #fff;
      margin: 0 5px;
      cursor: pointer;
    }
  }

  .grid-col-handler {
    position: absolute;
    top: -2px;
    left: -2px;
    height: 22px;
    line-height: 22px;
    background: $--color-primary;
    z-index: 9;

    i {
      font-size: 14px;
      font-style: normal;
      color: #fff;
      margin: 4px;
      cursor: default;
    }
  }
}

.grid-col-action,
.grid-col-handler {
  :deep(.svg-icon) {
    margin-left: 0.1em;
    margin-right: 0.1em;
  }
}
</style>
